In 2004, she was a high school student and joined the youth team for the Speranza FC Takatsuki.

In May 2008, Kaihori was selected by the Japan national team for the 2008 AFC Women's Asian Cup.

[1] She was Japan's goalkeeper in the 2011 World Cup final, where she saved two penalties from Shannon Boxx and Tobin Heath in the shoot-out.

[2] She was part of the Japanese team that finished second and earned the silver medal at the 2012 Summer Olympics, playing in one game, vs South Africa, which saw Kaihori keep a clean sheet.

This biographical article related to women's association football in Japan is a stub.